At the title screen, simultaneously press and hold L1, R1, L2, and R2 on Controller Two. After the screen ßashes and the Hot Shots logo is bouncing toward you, quickly press Up, Up, Down, Up, Left, Right, Right, Left, Up, Up, Down, Up, Left, Right, Right, Left on Controller Two. You must enter the button presses before the logo stops bouncing, or the code won't work. If you entered the code correctly, you'll hear a sound. Now you can select any character, play on any course, and access the Challenge mode.
Make a Character a Lefty or a Righty and Mirror Courses
Make a Character a Lefty or a Righty: At the Character Select screen, highlight any player, then press and hold L1, and press X.
Mirror Courses: At the Course Select screen, highlight any of the courses, then simultaneously press and hold L1 and L2, and press X.